java.lang.NullPointerException: Attempt to invoke virtual method 'long org.hello.tweetconsumer.Greeting.getProductId()' on a null object reference

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Attempt to invoke virtual method 'long org.hello.tweetconsumer.Greeting.getProductId()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'long org.hello.tweetconsumer.Greeting.getProductId()' on a null object reference
at org.hello.tweetconsumer.MainActivity$HttpRequestTask.onPostExecute(MainActivity.java:107)
at org.hello.tweetconsumer.MainActivity$HttpRequestTask.onPostExecute(MainActivity.java:82)
at android.os.AsyncTask.finish(AsyncTask.java:651)

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